Genetics Answers

In a certain species of plants, scented and odorless flowers occur, together with hairy and smooth stems.  A scented, smooth-stemmed plant was crossed with a fully homozygous odorless plant with hairy stems.  Indicate the possible genotypes and phenotypes of the parents and offspring that would produce four kinds of phenotypes among the offspring, in equal numbers (1:1:1:1).  Assume scented and smooth are dominant

does genetic recombination occurs when new gene combinations are produced by crossing over and segregation

The gene for the human protein albumin spans a

chromosomal region 25,000 nucleotide pairs (25 kilo-

bases, or kb) long from the beginning of the protein-coding sequence to the end of the protein-

coding sequence, but the messenger RNA for this protein is only 2.1 kb long. What do you think accounts

for this huge difference?

Using the Hardy-Weinberg Formula in studying population genetics, solve for:

a) genotype frequency of a heterozygous stag (male) and;

b) the probability of a doe (female) breeding with it.

The gene for the human protein albumin spans a

chromosomal region 25,000 nucleotide pairs (25 kilo-

bases, or kb) long from the beginning of the protein-coding sequence to the end of the protein-

coding sequence, but the messenger RNA for this protein is only 2.1 kb long. What do you think accounts

for this huge difference?

In the common fruit fly Drosophila melanogaster (that you find around your fruit and vegetables at home) clear wings is dominant over patterned wings. Fruit flies can have red eyes, white eyes and sometimes pink eyes. A male fruit fly Beelzebub is heterozygous for clear wings and has red eyes. He mates with a female fruit fly Jezebel who is homozygous recessive for patterned wing and has white eyes.Write a let statement, State the genotype of the parents, show the Punnett square and probabilities for phenotypes of the offspring. 

You are breeding rare unicorns for two traits: colour and tail length. You know from your experience that if you take a purebred blue unicorn and cross it with a purebred yellow unicorn all of the offspring are green unicorns. For tail length, you know that long tails are dominant over short tails. You cross a unicorn that is green and has a short tail with one that is green and has a long tail(heterozygous). What is the F1 generation? 

The gene for the human protein albumin spans a

chromosomal region 25,000 nucleotide pairs (25 kilo-

bases, or kb) long from the beginning of the protein-coding sequence to the end of the protein-

coding sequence, but the messenger RNA for this protein is only 2.1 kb long. What do you think accounts

for this huge difference?

Make any two monohybrid cross, write the genotypic and phenotypic ratio.

Q.2: The gene for the human protein albumin spans a chromosomal region 25,000 nucleotide pairs (25 kilo-bases, or kb) long from the beginning of the protein-coding sequence to the end of the protein-

coding sequence, but the messenger RNA for this protein is only 2.1 kb long. What do you think accounts

for this huge difference?